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Re: port-m68k/55990: kernel stack leak in m68k cpu_setmcontext() and reenter_syscall()
The following reply was made to PR port-m68k/55990; it has been noted by GNATS.
From: Jason Thorpe <thorpej%me.com@localhost>
Subject: Re: port-m68k/55990: kernel stack leak in m68k cpu_setmcontext() and
Date: Mon, 22 Feb 2021 07:58:15 -0800
> On Feb 21, 2021, at 4:40 AM, Izumi Tsutsui <tsutsui%ceres.dti.ne.jp@localhost> =
> With this patch, the Xorg based servers both on sun3 and x68k survive
> over 24 hours without kernel crashes.
> (Note the similar x68k crashes were observed at least back in 2012.)
> I wonder if we should also check frame->f_stackadj in trap0()
> but I would like to commit this fix (workaround?) for now.
> Any comments (especially from m68k and siginfo gurus; kleink@? =
> are appreciated.
I'm really digging into archival section of by brain for this one, but =
this change seems perfectly reasonable.
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